package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //1、获取本次请求的URI
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String uri = request.getRequestURI();
        log.info("拦截到的请求路径:{}",uri);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login"
        };
        //判断本次请求是否要处理
        boolean check = check(urls,uri);
        if (check){
            log.info("本次请求{}不需要处理",uri);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("已经登录了，登录的id为:{}",request.getSession().getAttribute("employee"));
            //把id扔线程池
            Long empId= (Long) request.getSession().getAttribute("employee");
            BaseContext.setThreadLocal(empId);
            filterChain.doFilter(request,response);
            return;
        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("已经登录了，登录的id为:{}",request.getSession().getAttribute("user"));
            //把id扔线程池
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setThreadLocal(userId);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户没登录");
        //未登录&&请求不在范围内，跳转到登录页面
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    private boolean check(String[] urls, String uri) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, uri);
            if (match){
                return true;
            }
        }
        return false;
    }
}
